AbstractThe magnets of ITER and future fusion plants will be subjected to fast neutron and γ-radiation over their lifetime, which influences the mechanical properties of the magnet insulation materials. The ITER candidate material CTD-112P, a two-dimensionally woven S2-glass-fibre reinforced epoxy, was investigated at 77 K in the static and fatigue modes in tension and interlaminar shear. The material was irradiated in the TRIGA reactor (Vienna) with several neutron fluences and by a 60Co-source (Madrid) up to 107 Gy. The results of the tensile tests show a minor reduction (∼5%) in the ultimate tensile strength caused by irradiation and a reduction in the tensile fatigue lifetime only at the highest neutron fluence (2×1022 m−2, E>0.1 MeV). The shear properties of the material are affected neither in the static nor in the fatigue mode up to a fast neutron fluence of 5×1021 m−2, i.e. a total absorbed dose of 2.8×107 Gy.
Fatigue strength for stainless steel irradiated by high power laser beam